Metals and materials international

The Korean Institute of Metals and Materials (대한금속재료학회)
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Novel Approach for Observing the Asymmetrical Evolution and the Compositional Nonuniformity of Laser Pulsed Atom Probe Tomography of a Single ZnO Nanowire

  • Seol, Jae-Bok (Department of Materials Science and Engineering, Pohang University of Science and Technology) ;
  • Kim, Young-Tae (Department of Materials Science and Engineering, Pohang University of Science and Technology) ;
  • Kim, Bo-Hwa (Department of Materials Science and Engineering, Pohang University of Science and Technology) ;
  • Park, Chan-Gyung (Department of Materials Science and Engineering, Pohang University of Science and Technology)
  • Received : 2015.07.13
  • Accepted : 2015.09.17
  • Published : 2016.01.20
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Abstract

The characterization of ZnO nanowires is crucial for developing nanostructured devices together with related compounds and alloys with an atomic-scale regime. This study describes the effects of laser energy on the atom probe tomography analysis of a single ZnO nanowire with a high aspect ratio, diameters of 80-100 nm and lengths of $10{\mu}m$. We observed both an asymmetrical evolution in the apex morphology and the compositional nonuniformities of Zn and O ions with respect to the laser energies ranging from 5 to 40 nJ. When the higher laser illumination exposed to the ZnO nanowires, non-uniform field strength becomes noticeable especially at the laser incident side of the samples. Moreover, we measured the charge state ratios of $Zn^+$ and $Zn^{2+}$ ions as a function of the applied laser energies. Our results proved important for accurate quantitative characterization and better interpretation for the laser-pulsed atom probe tomography of ZnO-based devices.

Keywords

Acknowledgement

Supported by : National Research Foundation of Korea (NRF)

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